*{
    margin: 0;
    padding: 0;
}
.header{
    width: 1200px;
    height: 90px;
    margin: 0 auto;
}
.header img{
    width:108px ;
    height: 48px;
    margin: 24px 0px 0px;
}
.main{
    height: 540px;
    background-color: gainsboro;
    padding: 40px 0 0;
}
.maincenter{
    width: 1200px;
    height: 580px;
    margin: 0 auto;
   
    background-color: ghostwhite;
}